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Chapter 2: Q4.70P (page 40)
Give the oxidation number of manganese in the following:
You need to provide the oxidation no of manganese for the given compounds.
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Magnesium oxide (MgO) forms when the metal burns in the air.How many grams of Mg are in534 g of MgO?
Samples of illicit “street” drugs often contain an inactive component, such as ascorbic acid (vitamin C). After obtaining a sample of cocaine, government chemists calculate the mass of vitamin C per gram of drug sample, and use it to track the drug’s distribution. For example, if different samples of cocaine obtained on the streets of New York, Los Angeles, and Paris all contain 0.6384 g of vitamin C per gram of sample, they very likely come from a common source. Do these street samples consist of a compound, element, or mixture? Explain.
What class of elements lies along the “staircase” line in the periodic table? How do their properties compare with those of metals and nonmetals?
Give the name, atomic symbol, and group number of the element with the following Z value, and classify it as a metal, metalloid, or nonmetal:
(a) Z = 33 (b) Z = 20 (c) Z = 35 (d) Z = 19 (e) Z = 13
The elements inGroupsandare all quite reactive. What is the major difference between them?
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